// license:BSD-3-Clause
// copyright-holders:Olivier Galibert, R. Belmont, hap, superctr
/*
ZOOM ZSG-2 custom wavetable synthesizer
*/
#ifndef MAME_SOUND_ZSG2_H
#define MAME_SOUND_ZSG2_H
#pragma once
// ======================> zsg2_device
class zsg2_device : public device_t,
public device_sound_interface
{
public:
zsg2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// configuration helpers
auto ext_read() { return m_ext_read_handler.bind(); }
DECLARE_READ16_MEMBER(read);
DECLARE_WRITE16_MEMBER(write);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
private:
const uint16_t STATUS_ACTIVE = 0x8000;
// 16 registers per channel, 48 channels
struct zchan
{
uint16_t v[16];
uint16_t status;
uint32_t cur_pos;
uint32_t step_ptr;
uint32_t step;
uint32_t start_pos;
uint32_t end_pos;
uint32_t loop_pos;
uint32_t page;
uint16_t vol;
uint16_t vol_initial;
uint16_t vol_target;
int16_t vol_delta;
uint16_t output_cutoff;
uint16_t output_cutoff_initial;
uint16_t output_cutoff_target;
int16_t output_cutoff_delta;
int32_t emphasis_filter_state;
int32_t output_filter_state;
// Attenuation for output channels
uint8_t output_gain[4];
int16_t samples[5]; // +1 history
};
uint16_t m_gain_tab[256];
uint16_t m_reg[32];
zchan m_chan[48];
uint32_t m_sample_count;
required_region_ptr<uint32_t> m_mem_base;
uint32_t m_read_address;
std::unique_ptr<uint32_t[]> m_mem_copy;
uint32_t m_mem_blocks;
std::unique_ptr<int16_t[]> m_full_samples;
sound_stream *m_stream;
devcb_read32 m_ext_read_handler;
uint32_t read_memory(uint32_t offset);
void chan_w(int ch, int reg, uint16_t data);
uint16_t chan_r(int ch, int reg);
void control_w(int reg, uint16_t data);
uint16_t control_r(int reg);
int16_t *prepare_samples(uint32_t offset);
void filter_samples(zchan *ch);
int16_t get_ramp(uint8_t val);
inline uint16_t ramp(uint16_t current, uint16_t target, int16_t delta);
};
DECLARE_DEVICE_TYPE(ZSG2, zsg2_device)
#endif // MAME_SOUND_ZSG2_H